Ulm in context: Street-network sprawl trends

Ulm in context

1.82.433.6<19751976–19901991–20052006–2020SNDi of street additions
1.82.433.6<19751976–19901991–20052006–2020SNDi of entire street network
UlmBaden-Wurttemberg (Region)Germany (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Ulm plotted against Baden-Württemberg and Germany. The SNDi of new construction in Ulm followed a zig-zag trend with an overall increase, compared to Baden-Württemberg which followed a zig-zag trend with an overall increase and Germany which rose steadily. Most recently, Ulm's incremental SNDi rose from 1.97 to 2.38 between 1991-2005 and 2006-2020. In terms of the aggregate network, Ulm ranked 6th out of 15 cities in Baden-Württemberg and 20th out of 99 in Germany as of 2020.

New Street Additions (2006–2020)

SNDi value
2.38
Rank in Germany
28th of 99
Rank in Baden-Württemberg
7th of 15

Entire Network (Aggregate)

SNDi value
1.73
Rank in Germany
20th of 99
Rank in Baden-Württemberg
6th of 15

Rankings go from most connected to most disconnected — rank 1 is the most connected.

What about similarly populated cities?

1.21.82.43<19751976–19901991–20052006–2020SNDi of street additions
1.21.82.43<19751976–19901991–20052006–2020SNDi of entire street network
UlmSidi SlimaneBei'an

In new street additions, Ulm fluctuated in its street-construction patterns, while Sidi Slimane built increasingly disconnected streets from 1975 through 1976-1990, then improved and Bei'an built increasingly disconnected streets from 1975 through 1991-2005, then improved. For the full network, Ulm and Bei'an both became progressively more disconnected, while Sidi Slimane grew more disconnected from 1975 through 1976-1990, then improved. Ulm and Sidi Slimane have been converging in their street-network character since 1975.